Scale pivot



Feb. 20, 1:9?3.y y 1,44512 H. O. HEM

SCALE PIVOT Filed Feb. la, wo

@14mm/Lto@ Patented Feb. 2tlg i923.

f unirse srarss linens: earner carinii;

HALVOR O. HEM, OE TOLEDO, OHIO, SSIS-NOR TD TOLEDO SCL'ECOMPANY, TOLEDO OHIO, A CORPORATON NEW JERSEY.

SCALE PIVOT.

Application filed February i8, 1920. Serial No. 359,605.

TQ @ZZ 'wim/m, t may concern: l

Be it known that Il, HALVOR O. HEM, a citizen of the United States, residing at To'- ledo, in the county of Lucas and State of hio, have invented certain new and useful linprmements in Scale Pivots, of which the following is a specification'.

rlhis invention relates to weighing scales and other instruments having knife edge pivots, and has particular reference to' devices for protecting the pivotsand bearings from dust and'corrosion. l Y

'Vhen scales are used in chemical manufacf turing establishments where the air contains the fumes of acids and lother corro'- sive agents, or where `such substances are likely to come into direct contact with'the pivots and bearings, in creameries where salt and water vapor are present, in mills and collieries where the mechanism must workin iioating dust or grit, or where the scale is not sufficiently protected from the weather, or is installed in proximity to salt water, the operation of the pivots and bearings is apt to be injuriously affected by the action of chemicals, fumes or dirt. The principal object of this inventionis the provision of a device to so hold grease or other semisolid protective substance that it substan: tially covers the operative parts of the pivot and bearing and thereby excludes not only dirt but moisture, fumes, and such matter as is likely to have a deleterious effect on'the life and continued accuracy of the scale.

Other objects and advantages willbe apparent from the following description, in which reference is had to the accompanying drawings illustrating a preferred embodiment of my invention and in which similar reference numerals designate similar parts throughout the several views.

In the drawings Figure l is a side elevation of a portion of a lever showing the device of my invention attached to the load pivot;

Figure 2 is an elevation with the device removed from the pivot; and

Figure 3 is an enlarged perspective view thereof.

Referring tothe drawings in detail, the lever l is provided with knife edge load and fulcrum pivots 2 andB which may be of any desired type and which, in theexample shown, are secured in place when the lever is cast. The pivot 3 rests upon a selfaligning bearing a pivoted upon a fulcrum bracket 5, while the load pivot 2 supports a' self-aligning bearing 6 pivoted to a platform supporting member 7. The structure above described is not per se a feature of my invcntion and shown only for the purpose of clearly illustrating a preferred embodiment e Since Vthe grooveof the bearing (5 opens v downwardly any packing ofgrease or other substance 'withvwhich itis filled soon falls out and leaves the knife edge ofthe pivot 2- unprotected. have therefore provided an attachment which consists essentially of a pair of shallow troughs 8 connected by a yoke 9. The adjacent edges of the troughs 8 are substantially parallel and so close-tog gether that the thickened or back portion of the pivot 2 cannot pass between them, so that when the device is slipped into the position in which it is shown in Figure 2', with the adjacent edges of the troughs engaging 'the converging sides of the pivot and the yoke i portion 9 passing beneath the pivot, it can i only be removed by sliding it outwardly.

For the `purpose of retaining the device and pivot in rigid relation a set screw ,10 is threaded through thel yoke 9 to engage the back of the pivot 2. When the set screw is turned up the troughs 8 are firmly clamped against the sides of the pivot l lt is apparent that while the device in no way interferes with the operation of the scale when the space above the troughs is filled with grease, foreign matter is effectively excluded from. the co-acting portions ofthe pivot and bearing. l'

The fulcrum pivot 3 has not been shown with the grease-holdingy device applied thereto for the reason that since the groove of the bearing 4f opens upwardly the bearing itself will hold packing "fairly eifectually without a special retainer. may, however, obviously be inverted and ap-` plied to this pivot also. I haveshown the grease retainer as an attachment adapted to be applied to a pivot of known construction, but it may be incorporated in the lever or the pivot structure, and its form, of course, will vary according to the type of pivot with which it is to be employed.

-While it will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fulfill the objects primarily stated, it isto The lretainer g Lei-eeee bearing, of means secured to seid pivot vfor retaining e semi-soiid piotective subst-ence about seid pivot.

2. n e device of the class described, the combination with mknii'e edge pivot and bea-ring, of means secured to seid'pivetfor' retaining e semi-soiid 'piotective substance' between the sides of seid pivot. and bearing.

3. in a device of the dass described, thecombinetion with e pivot, oi means for retaining ai Semieohd protective substanceabout seid pivot, seid ineens comprising; eupporting members adjacent each side oi" seid pivot and xedly connected thereto,

4:. In e rdevice lof the class described, the

combination with e pivot, o means 'for retaining e semi-solidi protective substance about seid pivot, seidmeens comprising supporting members detechebiy secured upon each side of said pivot.A

5; n e vdevice of the class deeci'ibed, the combination with e` pivot, oi means-for retaining :t semi-solid protective substance about seid pivot, seid means comprising trough-like suppoifting members detalchably secured upon! each eidey of Seid pivot.

6. A device for retaining a. semi-solid protective substance upon e.v pivot comprising e pair of supporting members, endnieens for securing said 'supporting members adjacent the pivot.

7. A devicefor retaining :L semi-solid protective substance upoit e pivot comprising a pair of supporting members', and e yoke connecting seid members.

8. A device forreteining; nl semi-solid protective substance 11p-one pivot comprising a pair of trough-Eke suppenting` members, and yoke connecting@y seid members.

9. devi'ce for retaining; e semi-solid-proteetive substance upon e pivot comprising e pair of tli'ougghdhe supporting. members,

'a yoke. -co1inectingsaidinembers, endl a set sci'evv threaded through seid yoke.

10. At grease retainer comprising, in com binatiome pair* of' tronghflike ysuppertii'ig members -a dapted f to engage the converging sides o e pivot, e yoke rigidly connecting seid members lend -edepted lto pass .ground the back off-seid pivot,..and e setscrewk threaded through seidr'yoke and adapted tok en gage said` pivot.l y

` -fHALVQRfOQ HEMI.

- "Witnesses:v

C. E. /VILCOX, C. OJLMARSHALL. 

